how well do you have to know the opponent b4 bluffing?

What do you look for in a player before you can push him off his hand?

I look for how often they fold to preflop raises and how they respond post flop.

How well do you have to know your opponent before not bluffing? Context matters, of course (are we talking about a light 3-bet/4-bet preflop? Bluff-raising the flop? Firing the second barrel on the turn? Shove-bluffing the river?). But when there's a spot where I think about bluffing, I'd rather bluff until someone calls me down with a marginal hand. That's when I might stop attacking them.

To answer my own questions:
light 3-bet/4-bet preflop? If someone is opening a lot of hands, or folding to a lot of 3-bets, you can start bluffing preflop.
Bluff-raising the flop? Against someone with a wide preflop range and high continuation bet percentage, you can bluff-raise a lot of dry flops. Floating them to bet or raise the turn is another option. This is mostly about finding boards that miss their range.
Firing the second barrel on the turn? Opponents who call the flop with a wide range are typically good to second barrel on the turn. Scare cards are usually more effective than blanks, but...
Shove-bluffing the river? If someone calls the flop and calls the turn, they rarely have a super strong hand. There are exceptions, but most of the time they'll be hoping that you check the river. I like to disappoint them. If I fire the turn as a bluff, there's a good chance I'm going to bomb the river. Sometimes it doesn't work out (I shipped Q-hi on a J5525 board into AA the other day), but it works often enough to show a profit.

As with anything, bluffing too often can get you in trouble. But they never know you're bluffing unless you get caught.

Thanks for posting ^

I tend to bluff aggressive players mostly.
I would say don't bluff a tight player or a calling station.
It mostly depends on your 'reads'
but the again...there's the metagame.

4b and 5b numbers generally take a long time to converge

if you dont know the player that well I think the tourney dynamics become the driving factor

and there is a big difference between have 20bbs and getting it in and having 6000 blinds and getting it in

gl at the tables,

t

after 8 tries won a small sit and go
It took a lot of effort to observe all players plus moving players around to different tables really messes any clear observation
Table dynamic and blinds level seem to play more of a significant role in buffing
I generally look for how players on my left defend their blinds and how they react to limps or raises
I pay attention to how the BB reacts to a limp from the SB or a raise from the SB

getting some experience in sng and mtt and i find the quality of play is generally better the deeper you get into the tournament.
in early stages I find there are a lot of calling station type players who call almost everything and very difficult to push of a hand.
So in the early stages it maybe easier to get chips by overbetting a good hand rather than trying to push players off their hands

Realy tough to bluff someone of a hand early in a tournament
Better to play straight forward hand and get to know the tendency then try the bluff after playing a showdown postflop with them
When the blinds get higher later in the tournament you can observe how they defend or give up their blinds preflop and push accordingly

Learn how to read hands before you think about bluffing. Most people just seem to bluff in random spots for the sake of bluffing. If you can't put somebody on an accurate range then don't bluff. I like to have somebody pinpointed on a fairly defined range then I can choose the appropriate bet sizing that I think will get them to fold their hand.

Some good advice here!
I like shove-bluffing at the river typically pot size or over-pot size .
someone who is openings a lot of hands, i been 3bet light if am at the BB , cant do it earlier in cas some behind does have a real hand.
Bluff-raising the flop not what I typically do against a high C-better, I prefer floating on the flop and betting /raising on the turn.
firing the second barrel on the turn....my favorite play...i do it with over cards/ just a draw/or bottom pair.

out of the 3/4 scenerios , Im betting and taking charge of the pot.
against a high c-better I'll float on the flop....and make him believe he's taking control.of the pot.